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  • Chemical Engineering  (1)
  • METALLIC MATERIALS  (1)
  • 2005-2009
  • 1985-1989  (1)
  • 1975-1979  (1)
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  • 2005-2009
  • 1985-1989  (1)
  • 1975-1979  (1)
  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Reliable detection of runaway reaction precursors in liquid phase reactions (1988)
    New York, NY : Wiley-Blackwell
    Plant/Operations Progress 7 (1988), S. 231-235 
    Details
    ISSN: 0278-4513
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A theoretical approach for early on-line detection of runaway reactions based on temperature derivative estimates is described and shown to be feasible in the laboratory. On-line process measurements were processed to yield smoothed derivative estimates and confidence intervals. These estimates were then compared to characteristics of potentially hazardous situations. If a match was sensed, preventive or emergency measures could be initiated. The problem lies in the tradeoff between earliest possible detection and false alarm avoidance.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prsb.720070407
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Kinetic studies of the stress corrosion cracking of D6AC steel (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of load interactions on the crack growth velocity of D6AC steel under stress corrosion cracking conditions was determined. The environment was a 3.5 percent salt solution. The modified-wedge opening load specimens were fatigue precracked and subjected to a deadweight loading in creep machines. The effects of load shedding on incubation times and crack growth rates were measured using high-sensitivity compliance measurement techniques. Load shedding results in an incubation time, the length of which depends on the amount of load shed and the baseline stress intensity. The sequence of unloading the specimen also controls the subsequent incubation period. The incubation period is shorter when load shedding passes through zero load than when it does not if the specimen initially had the same baseline stress intensity. The crack growth rates following the incubation period are also different from the steady-state crack growth rate at the operating stress intensity. These data show that the susceptibility of this alloy system to stress corrosion cracking depends on the plane-strain fracture toughness and on the yield strength of the material.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-X-64923
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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